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<html lang="en"xmlns:th="http://www.thymeleaf.org">
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    <meta charset="UTF-8">
    <title>Title</title>
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<div th:fragment="header" style="width: 100%; height: 80px;background: deepskyblue; color:white; font-size: 25px; font-family:楷体">
    这是herder!!! </div>
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</html>